// 全局灰,与其它样式叠加使用
html,body {
	filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
	-webkit-filter: grayscale(100%);
	-moz-filter: grayscale(100%);
	-ms-filter: grayscale(100%);
	-o-filter: grayscale(100%);
	filter: grayscale(100%);
	filter: gray;
}